F.2A Group 4

There are many chemicals in the printing ink. We divide them into five groups:

 Alcohol

 Isopropanol, etc. 

 Organic solvent

Toluene, trichloroethylene, perchlorcethylene, ethylene glycol, etc.   

Resin Acrylic resin, epoxy resin, etc. 

 Dyes

 Aniline, toluidine, azo dyes, etc. 

 Others

 Oxalic acid, plasticizer, wax, etc. 

Some of the chemicals have bad effect to our body. They will affect our health through 3 ways:

1. Touch the printing ink for a long time2. Swallow the ink carelessly3. Smell the ink for a long time (only printing technician)

The main impacts are…•Stimulate the skin•Stimulate the respiratory tract•Damage the central nervous system•Damage the liver

They may cause…•Paralysis•Pulmonary edema

Less ink comes outLess ink comes out More ink comes outMore ink comes out

Materials and apparatus:Materials and apparatus:

Newspapers Sing Tao Daily

Ming Pao

am730Headline Daily

StudentStandard

The Standard

Title: The level of the printing inkTitle: The level of the printing ink

Here are the materials and apparatus(left)

Materials

Pieces of tissue

Cotton sheet

Pieces of paper

Procedure:

1. Choose the black area of the newspaper.

2. Use a piece of tissue/cotton/paper to rub on the black area five times by using the same strength.

3. The result of the tissues is shown below:

0

1

2

3

4

5Headline Daily

AM 730

The StudentStandard

The Standard

Sing Tao Daily

Ming Pao

The result of the cottons is shown below:

0

1

2

3

4

5

Headline daily

AM730

Student Standard

The Standard

Sing Tao Daily

Ming Pao

The result of the papers is shown below:

Conclusion:The ink of Sing Tao Daily and Ming Pao

goes out from the newspaper difficultly.The ink of Student Standard and am730 goes out from

the newspaper easily.

0

1

2

3

4

5

Headline Daily

AM730

Student Standard

The Standard

Sing Tao Daily

Ming Pao

Title: The newspapers in the soapy waterMaterials and apparatus:1. Those six kinds of newspaper2. A large amount of water3. A bottle of foaming soap 4. A chopstick

Here are the materials and apparatus:

2. Put the newspaper (the size is about 37.5cm x 29cm) into it.

Procedure:

1. Put about 700 ml tap water into the basin and add two big drops of foaming soap.

3. Stir it with a chopstick for 1 minute.

4. The result is shown: (right)

Failed!

Conclusion:•The results of six kinds of newspaper are the same.•We can just see that the water becomes dirty.•The result of the experiment is not clear.

So this experiment is failed…..

Title: The newspapers in the alcoholMaterials and apparatus:1. 100ml alcohol (70%) 2. Those six kinds of newspaper3. Six small trays 4. A pair of scissors (for cutting)5. A ruler (for measuring) 6. Dropper

Procedure:

1. Cut out the suitable area of the newspaper. ( One side is all black. The other side is only words. The size is 3cm x 3cm ) Put it into a small tray.

The newspaper become translucent!The colour of alcohol will change into purple or pink!We will make a scale for the colour changing of the alcohol after the ink dissolves in it…

Less ink dissolves in itLess ink dissolves in it More ink dissolves in itMore ink dissolves in it

2. Add 5ml alcohol into the small tray with a dropper.

3. After 2 minutes, the result is below:

The levels of different printing ink are shown below:

Conclusion: The ink of Student Standard and AM730 dissolves in the alcohol easily.The ink of Ming Pao dissolves in the alcohol difficultly.

0

1

2

3

4

5

Headline Daily

AM730

Student Standard

The Standard

Sing Tao Daily

Ming Pao

Through this project, we can tell the students that :•The chemicals in the printing ink can affect our body health.•When you are reading Student Standard and am730,be more careful.•After reading newspaper, we must wash our hands. Then, we can read the newspapers more healthily.

References:

1. http://www.iosh.gov.tw/data/f2/sp64-4.htm2. Wikipedia

There maybe different chemicals

in different newspapers,but we

can’t find them out. We can only

find the most common chemicals.

We feel sorry about this.